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Dense pair plasma generation and its modulation dynamics in counter-propagating laser field

Chinese Physics B 2018年第10期27卷 433-439页

作者： Wei-Yuan Liu Wen Luo Tao Yuan Ji-Ye Yu Min Chen School of Nuclear Science and Technology University of South ChinaHengyang 421001China Key Laboratory for Laser Plasmas（MoE） School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

With two-dimensional quantum electrodynamics（QED） particle-in-cell simulations, a dense electron-positron（e^-e~＋） pair generation from laser-solid interactions is demonstrated. When the interaction of two linearly polarized laser pulses with a thin target enters into the relativistic transparency regime, a stable standing wave（SW） field can be formed by the overlap of the two counter-propagating laser pulses directly. The present study aims to clarify the effects of the S W field on the dynamics of e^-e^＋ pair plasmas. Our results indicate that under the combined effect of the SW field and radiation reaction（RR） effect, the created e^-e^＋ pairs can be trapped into the electric field nodes when the field strength is *** trapping effect contributes to the generation of γAV≥400 and ultra-dense pair plasmas in the two-side irradiation scheme. Despite different laser intensities, these pair plasmas have a Maxwellian spectral distribution with a peak energy of 150 MeV. Besides, the periodical modulation of the average energy, spatial, phase-space, and angular patterns of the e^-e^＋ pair plasmas can be triggered. In the angular patterns, as long as the SW field exists, pair plasmas can be pinched along the laser polarization direction. These results may offer a better understanding of the laser-solid interactions in the experiments when 10-PW laser facilities come into operation in the future.

关键词： PIC simulation laser-plasma interaction standing wave radiation reaction

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Accelerated Multi-Level Atoms in an Electromagnetic Vacuum and Fulling-Davies-Unruh Effect

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Chinese Physics Letters 2008年第5期25卷 1575-1578页

作者：朱致英余洪伟 Department of Physics and Institute of Physics Flunan Normal University Changsha 410081

We consider, from the point of view of a coaccelerated frame, a uniformly accelerated multi-level atom in interaction with vacuum quantum electromagnetic fields in the multi-polar coupling scheme, and calculate the rate of change of the atom＇s energy assuming a thermal bath at a finite temperature T in the Rindler wedge. Comparison with the spontaneous excitation rate of the atom calculated in the instantaneous inertial frame of the atom shows that both the inertial and coaccelerated observer would agree with each other only when the temperature of the thermal bath equals the FDU value TFDU = α/2π.

关键词： SPONTANEOUS EXCITATION radiation reaction FLUCTUATIONS QUANTIZATION SPACETIME BOUNDARY FIELD

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Spontaneous Emission of an Inertial Multi-Level Atom in a Spacetime with a Reflecting Plane Boundary

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Chinese Physics Letters 2006年第8期23卷 2012-2015页

作者：朱致英余洪伟 Department of Physics Hunan Normal University Changsha 410081

We calculate the contributions of the vacuum fluctuations and radiation reaction to the rate of change of the mean atomic energy for a multi-level hydrogen atom in the multipolar coupling scheme in a spacetime with a reflecting boundary. Our results show that, due to the presence of the boundary, the polarizations of the atom in the parallel direction and in the normal direction are weighted differently in terms of their contributions to the spontaneous emission rate, which is an oscillating function of the atom distance from the boundary. The possible experimental implications of our result are briefly discussed.

关键词： CHARGED TEST PARTICLE VACUUM FLUCTUATIONS radiation reaction CYLINDRICALSPACETIME RANDOM MOTION VELOCITY ENERGY SYSTEM SHIFTS

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Optimization and control of synchrotron emission in ultraintense laser–solid interactions using machine learning

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High Power Laser Science and Engineering 2023年第3期11卷 15-31页

作者： J.Goodman M.King E.J.Dolier R.Wilson R.J.Gray P.McKenna SUPA Department of Physics University of StrathclydeGlasgowUK The Cockcroft Institute Sci-Tech DaresburyWarringtonUK

The optimum parameters for the generation of synchrotron radiation in ultraintense laser pulse interactions with planar foils are investigated with the application of Bayesian optimization,via Gaussian process regression,to 2D particle-incell *** properties of the synchrotron emission,such as the yield,are maximized,and simultaneous mitigation of bremsstrahlung emission is achieved with multi-variate objective *** angle-of-incidence of the laser pulse onto the target is shown to strongly influence the synchrotron yield and angular profile,with oblique incidence producing the optimal *** is further explored in 3D simulations,in which additional control of the spatial profile of synchrotron emission is demonstrated by varying the polarization of the laser *** results demonstrate the utility of applying a machine learning-based optimization approach and provide new insights into the physics of radiation generation in laser-foil interactions,which will inform the design of experiments in the quantum electrodynamics(QED)-plasma regime.

关键词： Bayesian optimization gamma rays laser-solid interactions machine learning radiation reaction

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Optimization and control of synchrotron emission in ultraintense laser–solid interactions using machine learning – CORRIGENDUM

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High Power Laser Science and Engineering 2024年第1期12卷 116-116页

作者： J.Goodman M.King E.J.Dolier R.Wilson R.J.Gray P.McKenna 不详

Due to an isolated error in the 3D simulation parameters,the laser energy and intensity(calculated using the energy)values were incorrectly stated as 10.9 J and 3×10^(22) W cm^(−2),respectively,in Sections 3.3,7 and *** correct values are 39.8 J and 1.1×10^(23) W cm^(−2).Similarly,the values stated for the higher energy case,109 J and 3×10^(23) W cm^(−2) in Section 7,should be 398 J and 1.1×10^(24) W cm^(−2),respectively.

关键词： Bayesian optimization gamma rays laser-solid interactions machine learning radiation reaction

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